Face mask breathing valve



FIG. 1 is a side perspective view of a face mask breathing valve showingour new design, the broken line showing of a face mask is forillustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front view of a face mask breathing valve in accordance withthis invention;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof with a left side view being a mirrorimage thereof;

FIG. 5 is bottom view thereof; and,

FIG. 6 is a top view thereof.

The ornamental design for a face mask breathing valve, as shown anddescribed.